To the st



(No Model.)`

J. L. BLACK. Y BLEGTROMAGNBTIG BRAKE.

Vezyzfazf/ Wa ZZZavZ,

Patented Oct. 22, 1895.

UNITED STATES PATENT Ormes.

JOHN L BLACK, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE ST. LOUIS ELEC- TRIC BRAKE COMPANY,` OF SAME PLACE.

. ELECTROMAGNETIC BRAKE.

SPECIFICATION forming part of' Letters atent o. 548,510, datedOctober 22, 1895.

Application tiled April 13,1895. Serial No. 546,669. (No modali) To @ZZ whom t may concern,.-

Be it known that I, J CHN L. BLACK, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Electromagnetic Brakes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specication.

to My present invention relates to an electromagnetic brake, wherein there is employed a magnet having an unobstructed central opening, and within which are located cores that are connected to the brake mechanism and which are adapted to come together Within the magnet; and my invention consists in forming the cores in sections, movably secured together, so as to close up when the brakes are applied, thus adding to the power 2o of the brake by providing a decreased movement to the core-sections as compared with the movement of the brakerods.

Figure I is a plan view illustrating the application of my brake to a pair of car-trucks.

Fig. Il is an enlarged side elevation of the magnet. Fig. Ill is an end view. Fig. IV is a section taken on line IV IV, Fig. II. Fig. V is a detail view showing the sectional cores closed up. 3c Referring to the drawings, 1 represents a pair of street-car trucks provided with the usual brake mechanism 2, connected to rods 8 in any suitable manner.

fl represents a magnet, which may be secured to the longitudinal timbers of the carbody by brackets or straps 6. The magnet has a head 7 at each end, through which the rods 3 pass, andthe inner ends of the rods are made fast to cores fitting within the hollow center 8 of the magnet'. The cores are .io made in sections 9, 10, and 11, the rods 3 being made fast to the outer sections 9, the sections being connected by bolts 12, the bolts being tapped into one of the sections and their heads fitting in sockets in the adjacent section, as shown in Fig. IV. The headed ends of the bolts fit loosely in the sections, so

as to permit of the sections closing up, as shown in Fig. V.

13 represents an ordinary rheostat for con- 5o trolling the circuit.

le represents springs surrounding the rods 3 within the head 7 and which serve to cushion the cores in their outward movement.

In operation, the current being turned on, 5 5 the sections of the cores will be drawn inwardly and will be caused to close up, as shown in Fig. V. By providing the sectional cores, it Will be seen that the inner sections will be near the center of the magnet before 6e the current is turned on and that the other sections are all a short distance therefrom, so that While the sections have individually but a short distance to travel their closing up causes a considerable movement of the rods 3.

I claim as my invention- In an electroniagnetic brake, the combination of a magnet having an unobstructed cen tral opening, cores formed in sections movably secured together, and connections be- 7o tween the outer sections of the cores and the brake mechanism, substantially as set forth.

' JOHN L. BLACK.

In presence of- E. S. KNIGHT, N. FINLEY. 

